*{
    margin: 0;
    padding: 0;
}

ul,li{
    list-style: none;
}

#main{
    display: flex;
}

#main div{
    width: 100%;
    height: 100vh;
    text-align: center;
}

#fst{
    background-color: #000;
    color: white;
    font-size: 30px;
}

#sed{
    border: 1px solid black;
    box-sizing: border-box;
}

#cont{
    border: 1px solid black;
    box-sizing: border-box;
}

.hl{
    background-color: white;
    color: black;
}

.Shl{
    background-color: skyblue;
    color: black;
}

.hidden{
    display: none;
}